Joint filling compositions

ABSTRACT

A JOINT FILING COMPOSITION PARTICULARLY INTENDED FOR USE BETWEEN ADJACENT PANELS OF WALL BOARD OR PLASTER BOARD TO OBTAIN JOINTS THAT RESIST BEADING AND RIDGING IS PROVIDED BY A MIXTURE OF PROTEINACEOUS BINDER, A RESINOUS BINDER, AN INORGANIC FILLER, AN ORGANIC FIBROUS FILLER, GLYCOL AND WATER, THE MIXTURE WHEN READY FOR USE HAVING A PUTTYLIKE CONSISTENCY.

United States Patent 3,557,029 JOINT FILLING COMPOSITIONS Louis AlonzoBergeron, 371 Main St., Tonawanda, NY. 14150 No Drawing. Filed Feb. 23,1968, Ser. No. 707,417 Int. Cl. C08h 7/00, 7/02 US. Cl. 260-8 3 ClaimsABSTRACT OF THE DISCLOSURE A joint filling composition particularlyintended for use between adjacent panels of wall board or plaster boardto obtain joints that resist heading and n'dging is provided by amixture of a proteinaceous binder, a resinous binder, an inorganicfiller, an organic fibrous filler, glycol and water, the mixture whenready for use having a puttylike consistency.

BACKGROUND OF THE INVENTION This invention relates to compositionsuseful in filling the joints between adjacent panels of plaster board orwall board in building construction of the drywall type and for othersimilar purposes.

In drywall construction the interior walls and/or ceilings are finishedwith large panels, usually of plaster board nailed to the studs. Theadjacent edges of the panels are usually beveled for a distance of twoinches from the edges and when applied are spaced, one from the other,about A inch to permit expansion caused by temperature and humiditychanges. Hitherto, the joints thus formed have been concealed bytroweling a paste-like material into the space between the adjacentpanels and on the beveled portions thereof, applying a tape along thejoint in the trough formed by the beveled panel portions, and coveringthe tape with two or three additional coats of the paste.

Difiiculty has been encountered with the joints of drywall constructionin a high percentage, about 75%, of installations, ridging and beadingof the joints occurring between thirty and ninety days after completionof the installation.

It is an object of the present invention to provide compositions thatmay be used in drywall installations to produce joints which resistbeading and ridging and permit smooth surfacing of the joints evenwithout the use of tape.

SUMMARY OF THE INVENTION The novel compositions of the present inventionhave a putty-like consistency and comprise a proteinaceous binder aswell as a resinous binder and an inorganic filler as well as a fibrousorganic filler. More specifically, the compositions are composed of amixture of water, glycol, a casein adhesive, a resinous latex, agranular mineral filler such as gypsum, and a fibrous cellulosic filler.

DESCRIPTION OF A PREFERRED EMBODIMENT The following is a compositionaccording to the invention which has been found to give superiorresults:

In compounding the composition it is preferred to first mix thepolyvinyl acetate, glycol, and water and then 3,557,029 Patented Jan.19, 1971 results in a rather crumbly damp mass which can be stored at 35-45 F. in a closed container for three years or more. When wanted foruse, the composition is warmed to 90 F. and may then be worked, as bykneading, into a plastic, putty-like, white mass which spreads readily.

In using the novel compositions of the invention, they are applied by aknife or trowel in the joints between adjacent sheets or panels ofplaster board, enough being used to fill the spaces between the sheetsor panels and permit shrinkage without cracking of the filler. Althoughthe compositions do not set up before use, the filling in the plasterboard joints hardens in about 30 minutes. If desired, an additionalamount of the novel composition may be applied over the beveled edges ofthe adjacent panels to provide a smooth, even surface over the joint,the composition being sanded after hardening, if desired, Alternatively,the joints may be leveled out by the use of con ventional tapes, andcements. The latter adhere well to the novel inventive compositions.

In any event, joints in which the novel compositions of the presentinvention are used do not head and ridge as do joints formed withconventional, known compositions.

Since, after hardening, the present novel compositions are somewhatwater repellent, they present advantages over many prior compositionswhen used in areas subject to dampness. Thus, for example, they aresuitable for use in filling in around tubs and for filling cracks orjoints between wall or plaster board in areas of high humidity. Further,because of their putty-like consistency, they may be shaped or molded toprovide decorative effects such as rosettes on walls or ceilings.

Although the example set forth above describes a composition that hasgiven excellent results, it will be under stood that the proportions ofthe ingredients may be varied if desired. Thus the casein adhesive orcement, that sold under the name Bedding Compound being suitable, mayvary between about 18% and 28%; the polyvinyl acetate latex, that soldunder the name Elvacet Emulsion being suitable, may vary between about5% and 1% (i.e. about 1% to 2.3% solids); the gypsum filler, the 80 meshmaterial sold under the name Metronite being suitable, may vary fromabout 20% to 30%; and the cellulose fiber filler, the 200 mesh productsold under the name Cellulose Wood Flock being suitable, may also varybetween about 20% and 30%. The glycol may vary between about 2% and 5%.The water content should be enough to make the novel products of theproper putty-like consistency. Obviously, changes in the otherconstituents will also require a change in the amount of water used.

It will also be understood that materials equivalent to those specifiedin the foregoing example may be substituted, in whole or in part, forthose specified and that other materials such as dyes, pigments, andodorants may be added in small amounts if desired without departing fromthe spirit of the present invention,

In the foregoing specification and the accompanying claims, percentagesrefer to percentages by weight and mesh sizes are based approximately onU.S. Standard Sieves.

I claim:

1. A joint filling composition consisting essentially of a mixture offrom about 18% to 28% casein cement as a proteinaceous binder, fromabout 1% to 2.3% polyvinyl acetate as a resinous binder, gypsum as aninorganic filler, cellulose fiber filler, glycol and sufficient water toprovide a putty-like consistency to the composition for application.

2. A composition as defined in claim 1 containing from about 18% to 28%of a casein cement binder, from about 1% to 2.3% of a polyvinyl acetatebinder, from about 20% to 30% of gypsum filler, from about 20% to 30% ofcellulose fiber filler, and about 2% to 5% glycol.

3. A composition as defined in claim 1 containing approximately 23.4%casein cement binder, 1.7% polyvinyl acetate binder, 23.4% gypsumfiller, 23.4% cellulose fiber filler, and 3.0% glycol.

4 References Cited UNITED STATES PATENTS 2,963,454 12/1960 Drugge et a1.2608 3,126,355 3/1964 Birten et al 260--8 5 3,297,601 1/ 1967 Baynard eta1. 260-8 3,303,147 2/1967 Elden 260-8 3,386,223 6/1968 Wegwerth 260-8WILLIAM H. SHORT, Primary Examiner 10 EVWOODBERRY, Assistant Examiner

